Soil drainage varies beyond the sandy surface
Mount Laurel's 2023 environmental inventory identifies the Freehold-Holmdel-Adelphia soil association, ranging from well drained to somewhat poorly drained. It also identifies the Colemantown-Kresson-Marlton association, which includes slowly permeable soils with sandy clay loam or sandy clay below the surface. That is why we do not infer a foundation's drainage from a handful of topsoil.
During an inspection, we compare exterior wet spots with the location of interior seepage. A soil map helps explain possible conditions, but it cannot tell us whether a specific crack leaks or an existing footing drain still works.